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* [binutils-gdb] [gdb/testsuite] Fix gdb.cp/casts.exp with -m32
@ 2022-05-08 17:38 Tom de Vries
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From: Tom de Vries @ 2022-05-08 17:38 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a1aaf801d5f0989ea0857dfd896830570603b523
commit a1aaf801d5f0989ea0857dfd896830570603b523
Author: Tom de Vries <tdevries@suse.de>
Date: Sun May 8 19:38:13 2022 +0200
[gdb/testsuite] Fix gdb.cp/casts.exp with -m32
When running test-case gdb.cp/casts.exp with target board unix/-m32, I run
into:
...
(gdb) print (unsigned long long) &gd == gd_value^M
$31 = false^M
(gdb) FAIL: gdb.cp/casts.exp: print (unsigned long long) &gd == gd_value
...
With some additional printing, we can see in more detail why the comparison
fails:
...
(gdb) print /x &gd^M
$31 = 0xffffc5c8^M
(gdb) PASS: gdb.cp/casts.exp: print /x &gd
print /x (unsigned long long)&gd^M
$32 = 0xffffc5c8^M
(gdb) PASS: gdb.cp/casts.exp: print /x (unsigned long long)&gd
print /x gd_value^M
$33 = 0xffffffffffffc5c8^M
(gdb) PASS: gdb.cp/casts.exp: print /x gd_value
print (unsigned long long) &gd == gd_value^M
$34 = false^M
(gdb) FAIL: gdb.cp/casts.exp: print (unsigned long long) &gd == gd_value
...
The gd_value is set by this assignment:
...
unsigned long long gd_value = (unsigned long long) &gd;
...
The problem here is directly casting from a pointer to a non-pointer-sized
integer.
Fix this by adding an intermediate cast to std::uintptr_t.
Tested on x86_64-linux with native and target board unix/-m32.
Diff:
---
gdb/testsuite/gdb.cp/casts.cc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/gdb/testsuite/gdb.cp/casts.cc b/gdb/testsuite/gdb.cp/casts.cc
index ea4dc961793..f64d13c26df 100644
--- a/gdb/testsuite/gdb.cp/casts.cc
+++ b/gdb/testsuite/gdb.cp/casts.cc
@@ -1,3 +1,5 @@
+#include <cstdint>
+
struct A
{
int a;
@@ -65,7 +67,7 @@ main (int argc, char **argv)
LeftRight gd;
gd.left = 23;
gd.right = 27;
- unsigned long long gd_value = (unsigned long long) &gd;
+ unsigned long long gd_value = (unsigned long long) (std::uintptr_t)&gd;
unsigned long long r_value = (unsigned long long) (Right *) &gd;
return 0; /* breakpoint spot: casts.exp: 1 */
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2022-05-08 17:38 [binutils-gdb] [gdb/testsuite] Fix gdb.cp/casts.exp with -m32 Tom de Vries
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